I have repeatedly tried listening to ASMR YT videos, however, I have found them actually highly irritating and not calming. The whispering (extreme soft speaking) cause me great annoyance. You are right in that not all people respond to ASMR videos in the same manner. However, a back massage with calming music, listening to powerful worship music, dialogue of a spiritual nature, sitting by water and meditation on Scripture are triggers for this sensation.
According to Setz, this citation generally alludes to the effectiveness of the human voice and soft or whispered vocal sounds specifically as a trigger of ASMR for many of those who experience it, as demonstrated by the responsive comments posted to YouTube videos that depict someone speaking softly or whispering, typically directly to camera.
Plus, it’s logistically difficult to study a phenomenon that requires quiet and prefers solitude. As Smith points out, fMRI machines are noisy and EEG tests (which Smith’s team also tried) involve attaching “goop and sensors” to the scalp, potentially interfering with the ability to feel tingles. As Smith puts it, “the tools we have are not relaxing.”
Many of those who experience ASMR report that some specific non-vocal ambient noises are also effective triggers of ASMR, including those like the sound of rain, fingers scratching or tapping a surface, the crushing of eggshells, the crinkling and crumpling of a flexible material such as paper, or writing. Many YouTube videos that are intended to trigger ASMR responses capture a single person performing these actions and the sounds that result.